/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package limiter

import (
	"testing"
	"time"

	"github.com/apache/incubator-horaedb-meta/server/config"
	"github.com/stretchr/testify/require"
)

const (
	defaultInitialLimiterRate     = 10 * 1000
	defaultInitialLimiterCapacity = 1000
	defaultEnableLimiter          = true
	defaultUpdateLimiterRate      = 100 * 1000
	defaultUpdateLimiterCapacity  = 100 * 1000
)

func TestFlowLimiter(t *testing.T) {
	re := require.New(t)
	flowLimiter := NewFlowLimiter(config.LimiterConfig{
		Limit:  defaultInitialLimiterRate,
		Burst:  defaultInitialLimiterCapacity,
		Enable: defaultEnableLimiter,
	})

	for i := 0; i < defaultInitialLimiterCapacity; i++ {
		flag := flowLimiter.Allow()
		re.Equal(true, flag)
	}

	time.Sleep(time.Millisecond)
	for i := 0; i < defaultInitialLimiterRate/1000; i++ {
		flag := flowLimiter.Allow()
		re.Equal(true, flag)
	}

	err := flowLimiter.UpdateLimiter(config.LimiterConfig{
		Limit:  defaultUpdateLimiterRate,
		Burst:  defaultUpdateLimiterCapacity,
		Enable: defaultEnableLimiter,
	})
	re.NoError(err)

	limiter := flowLimiter.GetConfig()
	re.Equal(defaultUpdateLimiterRate, limiter.Limit)
	re.Equal(defaultUpdateLimiterCapacity, limiter.Burst)
	re.Equal(defaultEnableLimiter, limiter.Enable)

	time.Sleep(time.Millisecond)
	for i := 0; i < defaultUpdateLimiterRate/1000; i++ {
		flag := flowLimiter.Allow()
		re.Equal(true, flag)
	}
}
